//
// Mixins
// --------------------------------------------------


// UTILITY MIXINS
// --------------------------------------------------

// Clearfix
// --------
// For clearing floats like a boss h5bp.com/q
.clearfix {
    *zoom: 1;
    &:before,
    &:after {
      display: table;
      content: "";
      // Fixes Opera/contenteditable bug:
      // http://nicolasgallagher.com/micro-clearfix-hack/#comment-36952
      line-height: 0;
    }
    &:after {
      clear: both;
    }
  }
  
  // Webkit-style focus
  // ------------------
  .tab-focus() {
    // Default
    outline: thin dotted #333;
    // Webkit
    outline: 5px auto -webkit-focus-ring-color;
    outline-offset: -2px;
  }
  
  // Center-align a block level element
  // ----------------------------------
  .center-block() {
    display: block;
    margin-left: auto;
    margin-right: auto;
  }
  
  // IE7 inline-block
  // ----------------
  .ie7-inline-block() {
    *display: inline; /* IE7 inline-block hack */
    *zoom: 1;
  }
  
  // IE7 likes to collapse whitespace on either side of the inline-block elements.
  // Ems because we're attempting to match the width of a space character. Left
  // version is for form buttons, which typically come after other elements, and
  // right version is for icons, which come before. Applying both is ok, but it will
  // mean that space between those elements will be .6em (~2 space characters) in IE7,
  // instead of the 1 space in other browsers.
  .ie7-restore-left-whitespace() {
    *margin-left: .3em;
  
    &:first-child {
      *margin-left: 0;
    }
  }
  
  .ie7-restore-right-whitespace() {
    *margin-right: .3em;
  }
  
  // Sizing shortcuts
  // -------------------------
  .size(@height, @width) {
    width: @width;
    height: @height;
  }
  .square(@size) {
    .size(@size, @size);
  }
  
  // Placeholder text
  // -------------------------
  .placeholder(@color: @placeholderText) {
    &:-moz-placeholder {
      color: @color;
    }
    &:-ms-input-placeholder {
      color: @color;
    }
    &::-webkit-input-placeholder {
      color: @color;
    }
  }
  
  // Text overflow
  // -------------------------
  // Requires inline-block or block for proper styling
  .text-overflow() {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  
  // CSS image replacement
  // -------------------------
  // Source: https://github.com/h5bp/html5-boilerplate/commit/aa0396eae757
  .hide-text {
    font: 0/0 a;
    color: transparent;
    text-shadow: none;
    background-color: transparent;
    border: 0;
  }
  
  
  // FONTS
  // --------------------------------------------------
  
  #font {
    #family {
      .serif() {
        font-family: @serifFontFamily;
      }
      .sans-serif() {
        font-family: @sansFontFamily;
      }
      .monospace() {
        font-family: @monoFontFamily;
      }
    }
    .shorthand(@size: @baseFontSize, @weight: normal, @lineHeight: @baseLineHeight) {
      font-size: @size;
      font-weight: @weight;
      line-height: @lineHeight;
    }
    .serif(@size: @baseFontSize, @weight: normal, @lineHeight: @baseLineHeight) {
      #font > #family > .serif;
      #font > .shorthand(@size, @weight, @lineHeight);
    }
    .sans-serif(@size: @baseFontSize, @weight: normal, @lineHeight: @baseLineHeight) {
      #font > #family > .sans-serif;
      #font > .shorthand(@size, @weight, @lineHeight);
    }
    .monospace(@size: @baseFontSize, @weight: normal, @lineHeight: @baseLineHeight) {
      #font > #family > .monospace;
      #font > .shorthand(@size, @weight, @lineHeight);
    }
  }
  
  
  // FORMS
  // --------------------------------------------------
  
  // Block level inputs
  .input-block-level {
    display: block;
    width: 100%;
    min-height: @inputHeight; // Make inputs at least the height of their button counterpart (base line-height + padding + border)
    .box-sizing(border-box); // Makes inputs behave like true block-level elements
  }
  
  
  
  // Mixin for form field states
  .formFieldState(@textColor: #555, @borderColor: #ccc, @backgroundColor: #f5f5f5) {
    // Set the text color
    .control-label,
    .help-block,
    .help-inline {
      color: @textColor;
    }
    // Style inputs accordingly
    .checkbox,
    .radio,
    input,
    select,
    textarea {
      color: @textColor;
    }
    input,
    select,
    textarea {
      border-color: @borderColor;
      .box-shadow(inset 0 1px 1px rgba(0,0,0,.075)); // Redeclare so transitions work
      &:focus {
        border-color: darken(@borderColor, 10%);
        @shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@borderColor, 20%);
        .box-shadow(@shadow);
      }
    }
    // Give a small background color for input-prepend/-append
    .input-prepend .add-on,
    .input-append .add-on {
      color: @textColor;
      background-color: @backgroundColor;
      border-color: @textColor;
    }
  }
  
  
  
  // CSS3 PROPERTIES
  // --------------------------------------------------
  
  // Border Radius
  .border-radius(@radius) {
    -webkit-border-radius: @radius;
       -moz-border-radius: @radius;
            border-radius: @radius;
  }
  
  // Single Corner Border Radius
  .border-top-left-radius(@radius) {
    -webkit-border-top-left-radius: @radius;
        -moz-border-radius-topleft: @radius;
            border-top-left-radius: @radius;
  }
  .border-top-right-radius(@radius) {
    -webkit-border-top-right-radius: @radius;
        -moz-border-radius-topright: @radius;
            border-top-right-radius: @radius;
  }
  .border-bottom-right-radius(@radius) {
    -webkit-border-bottom-right-radius: @radius;
        -moz-border-radius-bottomright: @radius;
            border-bottom-right-radius: @radius;
  }
  .border-bottom-left-radius(@radius) {
    -webkit-border-bottom-left-radius: @radius;
        -moz-border-radius-bottomleft: @radius;
            border-bottom-left-radius: @radius;
  }
  
  // Single Side Border Radius
  .border-top-radius(@radius) {
    .border-top-right-radius(@radius);
    .border-top-left-radius(@radius);
  }
  .border-right-radius(@radius) {
    .border-top-right-radius(@radius);
    .border-bottom-right-radius(@radius);
  }
  .border-bottom-radius(@radius) {
    .border-bottom-right-radius(@radius);
    .border-bottom-left-radius(@radius);
  }
  .border-left-radius(@radius) {
    .border-top-left-radius(@radius);
    .border-bottom-left-radius(@radius);
  }
  
  // Drop shadows
  .box-shadow(@shadow) {
    -webkit-box-shadow: @shadow;
       -moz-box-shadow: @shadow;
            box-shadow: @shadow;
  }
  
  // Transitions
  .transition(@transition) {
    -webkit-transition: @transition;
       -moz-transition: @transition;
         -o-transition: @transition;
            transition: @transition;
  }
  .transition-delay(@transition-delay) {
    -webkit-transition-delay: @transition-delay;
       -moz-transition-delay: @transition-delay;
         -o-transition-delay: @transition-delay;
            transition-delay: @transition-delay;
  }
  .transition-duration(@transition-duration) {
    -webkit-transition-duration: @transition-duration;
       -moz-transition-duration: @transition-duration;
         -o-transition-duration: @transition-duration;
            transition-duration: @transition-duration;
  }
  
  // Transformations
  .rotate(@degrees) {
    -webkit-transform: rotate(@degrees);
       -moz-transform: rotate(@degrees);
        -ms-transform: rotate(@degrees);
         -o-transform: rotate(@degrees);
            transform: rotate(@degrees);
  }
  .scale(@ratio) {
    -webkit-transform: scale(@ratio);
       -moz-transform: scale(@ratio);
        -ms-transform: scale(@ratio);
         -o-transform: scale(@ratio);
            transform: scale(@ratio);
  }
  .translate(@x, @y) {
    -webkit-transform: translate(@x, @y);
       -moz-transform: translate(@x, @y);
        -ms-transform: translate(@x, @y);
         -o-transform: translate(@x, @y);
            transform: translate(@x, @y);
  }
  .skew(@x, @y) {
    -webkit-transform: skew(@x, @y);
       -moz-transform: skew(@x, @y);
        -ms-transform: skewX(@x) skewY(@y); // See https://github.com/twitter/bootstrap/issues/4885
         -o-transform: skew(@x, @y);
            transform: skew(@x, @y);
    -webkit-backface-visibility: hidden; // See https://github.com/twitter/bootstrap/issues/5319
  }
  .translate3d(@x, @y, @z) {
    -webkit-transform: translate3d(@x, @y, @z);
       -moz-transform: translate3d(@x, @y, @z);
         -o-transform: translate3d(@x, @y, @z);
            transform: translate3d(@x, @y, @z);
  }
  
  // Backface visibility
  // Prevent browsers from flickering when using CSS 3D transforms.
  // Default value is `visible`, but can be changed to `hidden
  // See git pull https://github.com/dannykeane/bootstrap.git backface-visibility for examples
  .backface-visibility(@visibility){
      -webkit-backface-visibility: @visibility;
         -moz-backface-visibility: @visibility;
              backface-visibility: @visibility;
  }
  
  // Background clipping
  // Heads up: FF 3.6 and under need "padding" instead of "padding-box"
  .background-clip(@clip) {
    -webkit-background-clip: @clip;
       -moz-background-clip: @clip;
            background-clip: @clip;
  }
  
  // Background sizing
  .background-size(@size) {
    -webkit-background-size: @size;
       -moz-background-size: @size;
         -o-background-size: @size;
            background-size: @size;
  }
  
  
  // Box sizing
  .box-sizing(@boxmodel) {
    -webkit-box-sizing: @boxmodel;
       -moz-box-sizing: @boxmodel;
            box-sizing: @boxmodel;
  }
  
  // User select
  // For selecting text on the page
  .user-select(@select) {
    -webkit-user-select: @select;
       -moz-user-select: @select;
        -ms-user-select: @select;
         -o-user-select: @select;
            user-select: @select;
  }
  
  // Resize anything
  .resizable(@direction) {
    resize: @direction; // Options: horizontal, vertical, both
    overflow: auto; // Safari fix
  }
  
  // CSS3 Content Columns
  .content-columns(@columnCount, @columnGap: @gridGutterWidth) {
    -webkit-column-count: @columnCount;
       -moz-column-count: @columnCount;
            column-count: @columnCount;
    -webkit-column-gap: @columnGap;
       -moz-column-gap: @columnGap;
            column-gap: @columnGap;
  }
  
  // Optional hyphenation
  .hyphens(@mode: auto) {
    word-wrap: break-word;
    -webkit-hyphens: @mode;
       -moz-hyphens: @mode;
        -ms-hyphens: @mode;
         -o-hyphens: @mode;
            hyphens: @mode;
  }
  
  // Opacity
  .opacity(@opacity) {
    opacity: @opacity / 100;
    filter: ~"alpha(opacity=@{opacity})";
  }
  
  
  
  // BACKGROUNDS
  // --------------------------------------------------
  
  // Add an alphatransparency value to any background or border color (via Elyse Holladay)
  #translucent {
    .background(@color: @white, @alpha: 1) {
      background-color: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);
    }
    .border(@color: @white, @alpha: 1) {
      border-color: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);
      .background-clip(padding-box);
    }
  }
  
  // Gradient Bar Colors for buttons and alerts
  .gradientBar(@primaryColor, @secondaryColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) {
    color: @textColor;
    text-shadow: @textShadow;
    #gradient > .vertical(@primaryColor, @secondaryColor);
    border-color: @secondaryColor @secondaryColor darken(@secondaryColor, 15%);
    border-color: rgba(0,0,0,.1) rgba(0,0,0,.1) fadein(rgba(0,0,0,.1), 15%);
  }
  
  // Gradients
  #gradient {
    .horizontal(@startColor: #555, @endColor: #333) {
      background-color: @endColor;
      background-image: -moz-linear-gradient(left, @startColor, @endColor); // FF 3.6+
      background-image: -webkit-gradient(linear, 0 0, 100% 0, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
      background-image: -webkit-linear-gradient(left, @startColor, @endColor); // Safari 5.1+, Chrome 10+
      background-image: -o-linear-gradient(left, @startColor, @endColor); // Opera 11.10
      background-image: linear-gradient(to right, @startColor, @endColor); // Standard, IE10
      background-repeat: repeat-x;
      filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@startColor),argb(@endColor))); // IE9 and down
    }
    .vertical(@startColor: #555, @endColor: #333) {
      background-color: mix(@startColor, @endColor, 60%);
      background-image: -moz-linear-gradient(top, @startColor, @endColor); // FF 3.6+
      background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
      background-image: -webkit-linear-gradient(top, @startColor, @endColor); // Safari 5.1+, Chrome 10+
      background-image: -o-linear-gradient(top, @startColor, @endColor); // Opera 11.10
      background-image: linear-gradient(to bottom, @startColor, @endColor); // Standard, IE10
      background-repeat: repeat-x;
      filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down
    }
    .directional(@startColor: #555, @endColor: #333, @deg: 45deg) {
      background-color: @endColor;
      background-repeat: repeat-x;
      background-image: -moz-linear-gradient(@deg, @startColor, @endColor); // FF 3.6+
      background-image: -webkit-linear-gradient(@deg, @startColor, @endColor); // Safari 5.1+, Chrome 10+
      background-image: -o-linear-gradient(@deg, @startColor, @endColor); // Opera 11.10
      background-image: linear-gradient(@deg, @startColor, @endColor); // Standard, IE10
    }
    .horizontal-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
      background-color: mix(@midColor, @endColor, 80%);
      background-image: -webkit-gradient(left, linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
      background-image: -webkit-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
      background-image: -moz-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
      background-image: -o-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
      background-image: linear-gradient(to right, @startColor, @midColor @colorStop, @endColor);
      background-repeat: no-repeat;
      filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
    }
  
    .vertical-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
      background-color: mix(@midColor, @endColor, 80%);
      background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
      background-image: -webkit-linear-gradient(@startColor, @midColor @colorStop, @endColor);
      background-image: -moz-linear-gradient(top, @startColor, @midColor @colorStop, @endColor);
      background-image: -o-linear-gradient(@startColor, @midColor @colorStop, @endColor);
      background-image: linear-gradient(@startColor, @midColor @colorStop, @endColor);
      background-repeat: no-repeat;
      filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
    }
    .radial(@innerColor: #555, @outerColor: #333) {
      background-color: @outerColor;
      background-image: -webkit-gradient(radial, center center, 0, center center, 460, from(@innerColor), to(@outerColor));
      background-image: -webkit-radial-gradient(circle, @innerColor, @outerColor);
      background-image: -moz-radial-gradient(circle, @innerColor, @outerColor);
      background-image: -o-radial-gradient(circle, @innerColor, @outerColor);
      background-repeat: no-repeat;
    }
    .striped(@color: #555, @angle: 45deg) {
      background-color: @color;
      background-image: -webkit-gradient(linear, 0 100%, 100% 0, color-stop(.25, rgba(255,255,255,.15)), color-stop(.25, transparent), color-stop(.5, transparent), color-stop(.5, rgba(255,255,255,.15)), color-stop(.75, rgba(255,255,255,.15)), color-stop(.75, transparent), to(transparent));
      background-image: -webkit-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
      background-image: -moz-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
      background-image: -o-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
      background-image: linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
    }
  }
  // Reset filters for IE
  .reset-filter() {
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(enabled = false)"));
  }
  
  
  
  // COMPONENT MIXINS
  // --------------------------------------------------
  
  // Horizontal dividers
  // -------------------------
  // Dividers (basically an hr) within dropdowns and nav lists
  .nav-divider(@top: #e5e5e5, @bottom: @white) {
    // IE7 needs a set width since we gave a height. Restricting just
    // to IE7 to keep the 1px left/right space in other browsers.
    // It is unclear where IE is getting the extra space that we need
    // to negative-margin away, but so it goes.
    *width: 100%;
    height: 1px;
    margin: ((@baseLineHeight / 2) - 1) 1px; // 8px 1px
    *margin: -5px 0 5px;
    overflow: hidden;
    background-color: @top;
    border-bottom: 1px solid @bottom;
  }
  
  // Button backgrounds
  // ------------------
  .buttonBackground(@startColor, @endColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) {
    // gradientBar will set the background to a pleasing blend of these, to support IE<=9
    .gradientBar(@startColor, @endColor, @textColor, @textShadow);
    *background-color: @endColor; /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    .reset-filter();
  
    // in these cases the gradient won't cover the background, so we override
    &:hover, &:focus, &:active, &.active, &.disabled, &[disabled] {
      color: @textColor;
      background-color: @endColor;
      *background-color: darken(@endColor, 5%);
    }
  
    // IE 7 + 8 can't handle box-shadow to show active, so we darken a bit ourselves
    &:active,
    &.active {
      background-color: darken(@endColor, 10%) e("\9");
    }
  }
  
  // Navbar vertical align
  // -------------------------
  // Vertically center elements in the navbar.
  // Example: an element has a height of 30px, so write out `.navbarVerticalAlign(30px);` to calculate the appropriate top margin.
  .navbarVerticalAlign(@elementHeight) {
    margin-top: (@navbarHeight - @elementHeight) / 2;
  }
  
  
  
  // Grid System
  // -----------
  
  // Centered container element
  .container-fixed() {
    margin-right: auto;
    margin-left: auto;
    .clearfix();
  }
  
  // Table columns
  .tableColumns(@columnSpan: 1) {
    float: none; // undo default grid column styles
    width: ((@gridColumnWidth) * @columnSpan) + (@gridGutterWidth * (@columnSpan - 1)) - 16; // 16 is total padding on left and right of table cells
    margin-left: 0; // undo default grid column styles
  }
  
  // Make a Grid
  // Use .makeRow and .makeColumn to assign semantic layouts grid system behavior
  .makeRow() {
    margin-left: @gridGutterWidth * -1;
    .clearfix();
  }
  .makeColumn(@columns: 1, @offset: 0) {
    float: left;
    margin-left: (@gridColumnWidth * @offset) + (@gridGutterWidth * (@offset - 1)) + (@gridGutterWidth * 2);
    width: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns - 1));
  }
  
  // The Grid
  #grid {
  
    .core (@gridColumnWidth, @gridGutterWidth) {
  
      .spanX (@index) when (@index > 0) {
        .span@{index} { .span(@index); }
        .spanX(@index - 1);
      }
      .spanX (0) {}
  
      .offsetX (@index) when (@index > 0) {
        .offset@{index} { .offset(@index); }
        .offsetX(@index - 1);
      }
      .offsetX (0) {}
  
      .offset (@columns) {
        margin-left: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns + 1));
      }
  
      .span (@columns) {
        width: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns - 1));
      }
  
      .row {
        margin-left: @gridGutterWidth * -1;
        .clearfix();
      }
  
      [class*="span"] {
        float: left;
        min-height: 1px; // prevent collapsing columns
        margin-left: @gridGutterWidth;
      }
  
      // Set the container width, and override it for fixed navbars in media queries
      .container,
      .navbar-static-top .container,
      .navbar-fixed-top .container,
      .navbar-fixed-bottom .container { .span(@gridColumns); }
  
      // generate .spanX and .offsetX
      .spanX (@gridColumns);
      .offsetX (@gridColumns);
  
    }
  
    .fluid (@fluidGridColumnWidth, @fluidGridGutterWidth) {
  
      .spanX (@index) when (@index > 0) {
        .span@{index} { .span(@index); }
        .spanX(@index - 1);
      }
      .spanX (0) {}
  
      .offsetX (@index) when (@index > 0) {
        .offset@{index} { .offset(@index); }
        .offset@{index}:first-child { .offsetFirstChild(@index); }
        .offsetX(@index - 1);
      }
      .offsetX (0) {}
  
      .offset (@columns) {
        margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + (@fluidGridGutterWidth*2);
          *margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%) + (@fluidGridGutterWidth*2) - (.5 / @gridRowWidth * 100 * 1%);
      }
  
      .offsetFirstChild (@columns) {
        margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + (@fluidGridGutterWidth);
        *margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%) + @fluidGridGutterWidth - (.5 / @gridRowWidth * 100 * 1%);
      }
  
      .span (@columns) {
        width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1));
        *width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%);
      }
  
      .row-fluid {
        width: 100%;
        .clearfix();
        [class*="span"] {
          .input-block-level();
          float: left;
          margin-left: @fluidGridGutterWidth;
          *margin-left: @fluidGridGutterWidth - (.5 / @gridRowWidth * 100 * 1%);
        }
        [class*="span"]:first-child {
          margin-left: 0;
        }
  
        // Space grid-sized controls properly if multiple per line
        .controls-row [class*="span"] + [class*="span"] {
          margin-left: @fluidGridGutterWidth;
        }
  
        // generate .spanX and .offsetX
        .spanX (@gridColumns);
        .offsetX (@gridColumns);
      }
  
    }
  
    .input(@gridColumnWidth, @gridGutterWidth) {
  
      .spanX (@index) when (@index > 0) {
        input.span@{index}, textarea.span@{index}, .uneditable-input.span@{index} { .span(@index); }
        .spanX(@index - 1);
      }
      .spanX (0) {}
  
      .span(@columns) {
        width: ((@gridColumnWidth) * @columns) + (@gridGutterWidth * (@columns - 1)) - 14;
      }
  
      input,
      textarea,
      .uneditable-input {
        margin-left: 0; // override margin-left from core grid system
      }
  
      // Space grid-sized controls properly if multiple per line
      .controls-row [class*="span"] + [class*="span"] {
        margin-left: @gridGutterWidth;
      }
  
      // generate .spanX
      .spanX (@gridColumns);
  
    }
  }